Improvement in machines for shaving stereotype and electrotype plates



E. T. JAMESON. MACHINE FOR SHAVYING S'TEREOTYPE AND ELECTROTYPE PLATES.

No.173,729.- P atented Febbzz, 18 76.

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iiqitnems I I UNITED STATES PATENT OFFICE.

EDWARD T. JAMESON, or rITTsB RG, PENNSYLVANIA.

IMPROVEMENT IN MACHINES FOR SHAVING STEREOTYPE AND ELECTROTYPE PLATES.

Specification forming part of Letters-Patent No. 173.729, dated February22, 1876; application filed July 22, 1875.

To all whom it may concern:

Be it known that I, EDWARD T. J AMESON, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented certain new anduseful Improvements in Devices for Locking up Stereotype or ElectrotypePlates in Shaving-Machines; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it pertains to make and useit, reference being had to the accompanying drawings, which form part ofthis specification, in which- Figure 1 is a side view of the machineembodying my improvement. Fig. 2 is an end view; and Fig. 3 is a detail,in section.

This invention has for its object the provision of improved means forsecuring curved electrotype or stereotype plates to the planingbed.

The apparatus in which curved stereotypes are placed to be planed andrendered applicable to their blocks usually comprises a concave troughcorresponding to the curvature of the plates, and provided with astationary cleat or stop at one side near the edge, against which theplate, when inserted, is brought to bear. Upon the opposite side arearranged the clamping devices, by means of which the plate is clampedand tightly held. These commonly comprise a number of wedges andcorresponding eccentrics, the former being laid upon the edge of theplate and tightened by the eccentrics.

Such contrivances are objectionable for several reasons, especially asbeing inconvenient to apply, liable to inaccuracy, and slow inadjustment.

My improvement is designed to obviate these disadvantages; and consists,accordingly, in the substitution for the wedges or keys of a singleadjustable'cleat, so fitted to the eccentrics that upon turning thelatter it may be readily brought against and released from thestereotype-plate.

My invention furthermore consists in the provision and novelconstruction of devices whereby, through the agency of a treadle andlevers, the eccentrics may be all turned sim'u1- taneously, and thecleat subjected to uniform and accurate adjustment, and retained inclose contact with the plate.

Referring to the accompanying drawing, A designates the planing-bed,mounted upon suitable supports B B 0 represents the stationary cleat,and G the adjustable clamping-cleat, the latter formed with severalbeveled openings, d, in which are arranged co rrespondingly-beveledeccentrics e, fixed upon the inner ends of rods 6, passing through andjournaled to the side of the bed A. Upon the outer ends of said rods arecranks f, hav

ing each a longitudinal slot, g. G is a hori-, zontal bar, having ashank, 9 which passes loosely through, and is supported by, an arm. 72.,projecting from the bed A, and having also studs 9 projecting inwardlyand respectively through the slots f, and at its end a stud, gprojecting outwardly and through a slot, 12/, in the end of anelbow-lever, H, pivoted to the support B. g

A treadle, I, is hinged to the base 13, and connected by a rod, I, tosaid elbow-lever. K is a toothed-rack or catch, also pivoted to thebase, and pressed toward the treadle by a suitable spring, k. Lrepresents a coiled spring, fastened to and encircling the shank 9between its end and the arm IL. I

The operation is as follows The adjustable cleat being raised, thecurved plate is inserted in the cavity of the bed and pressed againstthe stationary cleat. The treadle is then depressed, and, through themedium of its connections withthe eccentrics, the latter are turned,bringing the clamping-cleat closely against the plate, in which positionit is held by the treadle-catch, which acts automatically. Uponreleasing thetreadle, the motion of the eccentrics is reversed by thepower of the spring L.

This improvement, it may be observed, is applicable to planing-bedsalready in use, the old holes of the eccentric rods being well adaptedfor the reception of the new.

Having fully described my invention, I claim as new- 1. The combination,in a stereotype or electrotype plate shaving machine, with the plate 0having the sockets d d d, of the eccentrics ee 6, substantially asdescribed.

2. The combinatiomwiththe clamping-cleat, have hereunto set my hand this15th day-of of the eccentrics, treaille, 23nd. inlteflimediate July,1875.: connection, substantia yas escri e c 3. The spring L,'incombination with the EDWARD JAMESO'N' rod G, cranks f, eccentrics e, andcleats G, Witnesses: substantially as described and shown. .THOS. J.MQTIGHE,

In testimony that I claim "theforegoing I FRANK A. POLLOGK.

